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Newest topics and users posts
21 Oct-02:12:00 Re: munich show (mineralientage) 2021 (Peter Lemkin)
21 Oct-01:29:27 Re: minerals and mysteries from a college collection (Peter Lemkin)
21 Oct-00:28:56 Munich show (mineralientage) 2021 - funny christoph keilmann (Jordi Fabre)
21 Oct-00:22:02 Munich show (mineralientage) 2021 - false autumn (Jordi Fabre)
20 Oct-22:53:15 The mizunaka collection - fluorite (Am Mizunaka)
20 Oct-16:57:39 Re: new generation for picture - ploum (Ploum)
20 Oct-16:20:17 Re: collection of sante celiberti (Sante Celiberti)
20 Oct-15:16:03 Re: some beautiful obsidian like rocks (Steveb)
20 Oct-14:57:37 Re: collection of sante celiberti (James Catmur)
20 Oct-14:47:31 Columbite on samarskite (Johan Kjellman)
20 Oct-14:05:12 Re: collection of sante celiberti (Sante Celiberti)
20 Oct-10:24:43 Re: some beautiful obsidian like rocks (R Saunders)
20 Oct-09:47:03 Re: some beautiful obsidian like rocks (James Catmur)
20 Oct-09:00:33 Re: some beautiful obsidian like rocks (Sprinklerdude)
20 Oct-08:48:40 Re: some beautiful obsidian like rocks (Matt_zukowski)
20 Oct-08:23:50 Some beautiful obsidian like rocks (Sprinklerdude)
20 Oct-06:20:17 Re: minerals and mysteries from a college collection (Marco Campos-venuti)
20 Oct-01:24:54 Re: minerals and mysteries from a college collection (Peter Lemkin)
20 Oct-00:20:44 Re: collection of ras (Robert Seitz)
19 Oct-23:40:09 Munich show (mineralientage) 2021 - tuesday (Jordi Fabre)
19 Oct-21:10:21 Re: minerals and mysteries from a college collection (Don Lum)
19 Oct-20:08:30 Re: minerals and mysteries from a college collection (Bob Carnein)
19 Oct-20:05:42 Re: minerals and mysteries from a college collection (Bob Carnein)
19 Oct-19:53:18 Re: minerals and mysteries from a college collection (Pete Richards)
19 Oct-19:49:04 Minerals and mysteries from a college collection (Pete Richards)

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  Topic: Will Barite save the world?
lluis

Replies: 15
Views: 1136

PostForum: Off-Topic and Introductions   Posted: Sep 24, 2021 10:26   Subject: Re: Will Barite save the world?
Hi, Matt

Tetrahedron Letters was even more highly regarded than MIT. More or less. God's word in chemistry! And peer reviewed by top people.
And they published said fake report... (with an infanti ...
  Topic: Will Barite save the world?
lluis

Replies: 15
Views: 1136

PostForum: Off-Topic and Introductions   Posted: Sep 24, 2021 08:25   Subject: Re: Will Barite save the world?
There is any difference in thermal heat transfer and radiative heat transfer?
It is just heat transfer,
To have such transfer, there should be a gradient: in otherer words. there should be a transfe ...
  Topic: Will Barite save the world?
lluis

Replies: 15
Views: 1136

PostForum: Off-Topic and Introductions   Posted: Sep 23, 2021 14:32   Subject: Re: Will Barite save the world?
Just curiosity....

If I do not understand bad thermodynamics, you could not send out more than you get...
Maybe just a misunderstanding in article, maybe a misunderstanding by writers....
As it h ...
  Topic: Mineral questions from a woodworker!
lluis

Replies: 3
Views: 607

PostForum: Off-Topic and Introductions   Posted: Sep 06, 2021 08:23   Subject: Re: Mineral questions from a woodworker!
Maybe late in answering, and with all due respects to Alfredo, I understand that you simply asked for somehow soft minerals in pastel colours...

If so, there are many... Some in green and blue (sam ...
  Topic: Tracing specimens from the Duchess of Northumberland (1787-1866)
lluis

Replies: 6
Views: 1034

PostForum: The histories behind mineral specimens   Posted: Aug 31, 2021 11:43   Subject: Re: Tracing specimens from the Duchess of Northumberland (1787-1866)
Well, maybe too naive, but if sold in auction, buyers could be known. And for what you say, they are...
Then, taking in account that it is not too old in time, many would be still alive. And addresse ...
  Topic: Aura Coating
lluis

Replies: 15
Views: 3092

PostForum: Incorrect classification and fakes   Posted: Jun 06, 2021 09:09   Subject: Re: Aura Coating
Hi, John

Agreed with you that is titanium coating..
That hydrochloric acid will take it out, well, maybe,,,,or maybe not...

I would suggest to treat with nitric acid, but that is dangerous (yel ...
  Topic: Airtight display boxes ?
lluis

Replies: 14
Views: 2476

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: May 25, 2021 08:54   Subject: Re: Airtight display boxes ?
Hi, Cascaillou

For what you are asking for, I think that you ask maybe for much too much...

I live at seaside (say, around 200 meters beach), and it is very humid.
I have villiaumite in a Jousi ...
  Topic: Price changes
lluis

Replies: 16
Views: 3179

PostForum: Off-Topic and Introductions   Posted: Apr 25, 2021 13:28   Subject: Re: Price changes
Maybe following dear Bergur..

When I was a child in 1960's, a ticket of metro, go and return, costed me 50 centimes (of peseta....), A ticket of bus, any something so astronomical as 50 cents of a ...
  Topic: Synthetic smoky quartz?
lluis

Replies: 11
Views: 2205

PostForum: Minerals and Mineralogy   Posted: Apr 11, 2021 14:01   Subject: Re: Synthetic smoky quartz?
I think as James: probably natural, maybe irradiated (man created smoky quartz).
I think irradiated

With best wishes

LLuís
  Topic: Natural or man-made?
lluis

Replies: 6
Views: 1900

PostForum: What is it? - Where is it from?   Posted: Mar 13, 2021 09:32   Subject: Re: Natural or man-made?
As John says, it looks very natural...
Just Chinese turquoise tends to get greener in short time (opposite to Persian one)...

It depends on price.... If bought for nothing, well, probably man made ...
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
lluis

Replies: 9
Views: 2766

PostForum: Minerals and Mineralogy   Posted: Mar 10, 2021 10:58   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
And to add a little more, Mn2+ and Mn3+ could be assessed by spectroscopy...

Not to be done at home, but easy to do in a lab with such devices, as likely a University would have....

With best wi ...
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
lluis

Replies: 9
Views: 2766

PostForum: Minerals and Mineralogy   Posted: Mar 10, 2021 04:21   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
I think anyone in the analysis department of Chemistry in any University near where you live...

At least, that is what I would do...

With best wishes

Lluís
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
lluis

Replies: 9
Views: 2766

PostForum: Minerals and Mineralogy   Posted: Mar 09, 2021 13:54   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
Hi, Julie

I am thinking it is just a difference due to manganese acting as colour giver,,,
Mn2+-Mn3+ could act as colour centers... Differences in concentration between them and in all could cause ...
  Topic: Beautiful durable and...common?
lluis

Replies: 8
Views: 3227

PostForum: Off-Topic and Introductions   Posted: Mar 04, 2021 03:03   Subject: Re: Beautiful durable and...common?
Dear Steve

I fear that if you may buy an incredible rare roman gold coin, 2000 years old as gold bullion, well, probably would get anything labeled as ancient roman incredibly rare 2000 years old r ...
  Topic: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2659

PostForum: Off-Topic and Introductions   Posted: Jan 30, 2021 09:24   Subject: Re: Heat changes some minerals - how?
Dear Alfredo,

Good point!
But, that is simply vapour pressure... Water evaporates because it tries to get the equilibrium with humidity in air. Done that air moves, it continues evaporating trying ...
  Topic: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2659

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 15:52   Subject: Re: Heat changes some minerals - how?
Dear Alfredo

Losing salt, NaCl, common salt, kitchen salt, by heating, well, it is very hard....
Boiling point for it is 1465ºC. And if in a compound, probably higher....

On the other hand, as ...
  Topic: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2659

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 13:28   Subject: Re: Heat changes some minerals - how?
Dear Peter

If mineral lose water, well, maybe pickish chemist, but changed also composition,
Which is one of the things Tom said that should not be..
Loosing water, reduction, oxidation are thin ...
  Topic: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2659

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 10:39   Subject: Re: Heat changes some minerals - how?
Dear Tom,

In case composition should not be altered, then it is simply a change among different forms stable at different temperatures....

If you raise the temperature, you would get the form th ...
  Topic: What type of mineral is this, or maybe a fossil?
lluis

Replies: 11
Views: 2636

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 29, 2021 10:34   Subject: Re: What type of mineral is this, or maybe a fossil?
`Hi, Rumpeltroll (any name? Troll uses to mean nothing nice in Internet, and to sign uses to be considered polite. Say me old fashioned....)

Mattias said what is already (maybe in sensu lato...) in ...
  Topic: Chromium in jewels
lluis

Replies: 3
Views: 1884

PostForum: Off-Topic and Introductions   Posted: Jan 25, 2021 13:04   Subject: Re: Chromium in jewels
Interesting question...

Answer

For red in ruby
http://www.webexhibits.org/causesofcolor/6AA.html
(link normalized by FMF)

For green in emerald
http://www.webexhibits.org/causesofcolor/6AB. ...
 
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